Influence of Erosion Induced by NaCl on the Mechanical Performances of Alkali-Activated Mineral Admixtures

作     者：Jing Yu Jie Ren Guangming Shen Weixiang Sun Hui Wang 

作者机构：Department of Architectural EngineeringNingbo PolytechnicNingbo315000China Technology and Performance Management DepartmentChina Construction Infrastructure Corp.Ltd.Beijing10029China Chief Engineer’s OfficeJiuzhou Engineering Design Co.Ltd.Zhengzhou451162China School of Civil Engineering and Geographic EnvironmentNingbo UniversityNingbo315000China 

出 版 物：《Fluid Dynamics & Materials Processing》 (流体力学与材料加工（英文）)

年 卷 期：2023年第19卷第9期

页      面：2385-2398页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by 2023 University-Level Scientific Research Project of Ningbo Polytechnic(NZ23002) the First Batch of Ningbo Construction Scientific Research Projects in 2023(20230106) 

主　　题：Mechanical performances alkali-activated NaCl dry-wet alternations NaCl freeze-thaw cycles microstructure 

摘      要：In this paper,the influence of NaCl freeze-thaw(F-T)cycles and dry-wet(D-W)alternations on theflexural,com-pressive and bonding strengths of alkali-activatedfly ash(FA)and a blast furnace slag powder(BFS)is *** considered NaCl concentration is 3%.The effect of polypropylenefibers on the mechanical strengths is also *** electron microscopy(SEM),thermogravimetry(TG)and X-ray diffraction(XRD)are selected to discern the mechanisms underpinning the NaCl-induced *** obtained results indicate that the best results in terms of material resistance are obtained with admixtures containing 60%BFS and 40%FA in terms of mass ratio and 3%polypropylenefibers in terms of volume *** maximum rates of decrease of theflexural,compressive and bonding strengths after 300 NaCl F-T cycles are 21.5%,20.3%and 22.6%,*** corresponding rates of decrease due to NaCl D-W alternations are 28.1%,26.1%and 31.5%,*** TG curves show that the alkali-activating activity of BFS is higher than that of ***,in thefirst case,the microstructure of the hydration products is more *** results also show that NaCl F-T cycles lead to increasing cracks in the alkali-activated BFS.